Abstract
In order to clarify the themal environment and the ways of living in the houses equipped with floors heating system, the surveys were carried at in last winter for 46 houses in Tokai area. It wag found thet 85% of the residents used supplemental heating facilitiaa while using floor heatirg system, and 20% of the residets used humidifiers. Characteristics of using time and control of floor tamperature in each living room were ford ag follows: 39% of residents controlled floor heating system at multiple times a day, and 50% of floor heating systetms were set as 30 degree Celsius of the surface temprature. These data will contribute to effictive utilization of floor heating system in relatively warm of Japan.